/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.ambari.logfeeder.credential;

import org.apache.commons.io.FileUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.File;
import java.nio.charset.Charset;

public class FileSecretStore implements SecretStore {

  private static final Logger logger = LogManager.getLogger(FileSecretStore.class);

  private final String fileLocation;
  private final String defaultSecret;

  public FileSecretStore(String fileLocation, String defaultSecret) {
    this.fileLocation = fileLocation;
    this.defaultSecret = defaultSecret;
  }

  public FileSecretStore(String fileLocation) {
    this.fileLocation = fileLocation;
    this.defaultSecret = null;
  }

  @Override
  public char[] getSecret() {
    try {
      File pwdFile = new File(fileLocation);
      if (!pwdFile.exists() && defaultSecret != null) {
        FileUtils.writeStringToFile(pwdFile, defaultSecret, Charset.defaultCharset());
        return defaultSecret.toCharArray();
      } else {
        return FileUtils.readFileToString(pwdFile, Charset.defaultCharset()).toCharArray();
      }
    } catch (Exception e) {
      logger.warn("Exception occurred during read/write password file.", e);
      return null;
    }
  }
}
